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Enhanced color contrast light source

a color contrast and light source technology, applied in the field of lamps, can solve the problems of reducing the lumen output of other lighting sources such as fluorescent lighting, affecting the adoption of fluorescent lighting in certain applications, and affecting the color quality of fluorescent lighting, so as to achieve the effect of improving color quality

Active Publication Date: 2009-04-23
SAVANT TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]Other features and advantages of this invention will be better appreciated from the following detailed description.

Problems solved by technology

However, the adoption of fluorescent lighting has been hindered in certain applications such as illuminating items in a retail setting.
Filtration with neodymium glass also tends to reduce the quantity of light produced by incandescent lamps.
This disadvantage is acceptable due to the sufficient brightness of incandescent lamps.
However, reduced lumen output in other lighting sources such as fluorescent lighting is less acceptable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0050]A T8 fluorescent lamp was constructed in accordance with otherwise conventional procedures, but with a phosphor layer comprising Yttrium Oxide:Eu (Y2O3:Eu) (YEO); (Ba,Sr,Ca)MgAl10O17:Eu2 (BAM) and (Ba,Sr,Ca)MgAl10O17:Eu2+,Mn2+ (BAMn). The weight percents (based on total weight of the phosphors) of the phosphors were 74.6 wt %, 0.9 wt % and 24.5 wt %, respectively. The lamp comprised a barrier layer between the glass envelope and the phosphor layer. FIG. 4 shows the emission spectrum for the lamp of this Example.

[0051]When energized, the lamp generated light having delta chroma values for each of the fifteen color samples of the CQS system as follows (delta chroma value / CQS color sample): −1.1 / VS 1; 3.7 / VS 2; −4.5 / VS 3; 4.2 / VS 4; 10.6 / VS 5; 18.6 / VS 6; 22 / VS 7; 7.6 / VS 8; −1 / VS 9; 2.5 / VS 10; 1.4 / VS 11; 4.7 / VS 12; 8.1 / VS 13; −2.2 / VS 14 and −5.6 / VS 15. The lamp produced chromaticity coordinates (x,y) of 0.446 and 0.391, an operating lumens per watt (L / w) value of about 76 and a Qa ...

example 2

[0053]A T8 fluorescent lamp was constructed in accordance with otherwise conventional procedures, but with a phosphor layer comprising 3.5MgO*0.5MgF2*GeO2;Mn4+ (MfG); Yttrium Oxide:Eu (Y2O3:Eu) (YEO); (Ba,Sr,Ca)MgAl10O17:Eu2+ (BAM); (Ba,Sr,Ca)MgAl10O17:Eu2+,Mn2+ (BAMn) and Cerium Lanthanum Phosphate (LaPO4:Ce,Tb) (LAP). The weight percents of the phosphors were 19.44 wt %, 52.24 wt %, 1.43 wt %, 12.37 wt % and 14.52 wt %, respectively. The lamp comprised a barrier layer between the glass envelope and the phosphor layer. FIG. 5 shows the emission spectrum for the lamp of this Example.

[0054]When energized, the lamp generated light having delta chroma values for each of the fifteen color samples of the CQS system as follows (delta chroma value / CQS color sample): 2.8 / VS 1; 4.2 / VS 2; −4.2 / VS 3; −1.3 / VS 4; 3.1 / VS 5; 9.1 / VS 6; 13.8 / VS 7; 8 / VS VS 8;4.3 / VS 9; 4.6 / VS 10; 0.6 / VS 1; 2.5 / VS12; 5.7 / VS13; 2 / VS 14 and −0.1 / VS15. The lamp produced chromaticity coordinates (x,y) of 0.444 and 0.396, a...

example 3

[0055]A T8 fluorescent lamp was constructed in accordance with otherwise conventional procedures, but with a phosphor layer comprising 3.5MgO*0.5MgF2*GeO2:Mn4+ (MfG); Yttrium Oxide:Eu (Y2O3:Eu) (YEO); (Ba,Sr,Ca)MgAl10O17:Eu2+ (BAM) and (Ba,Sr,Ca)MgAl10O17:Eu2+,Mn2+ (BAMn). The weight percents of the phosphors were 23.88 wt %, 57.44 wt %, 1.13 wt % and 17.56 wt %, respectively. The lamp comprised a barrier layer between the glass envelope and the phosphor layer.

[0056]When energized, the lamp generated light having delta chroma values for each of the fifteen color samples of the CQS system as follows (delta chroma value / CQS color sample): 2 / VS 1; 5.3 / VS 2; −3.2 / VS 3; 6.4 / VS 4; 13.1 / VS 5; 21.9 / VS6; 27 / VS7; 11.9 / VS 8; 3 / VS 9; 10 / VS 10;7.8 / VS 11; 9.4 / VS 12; 11.7 / VS 13; 5.6 / VS14 and 0.2 / VS15. The lamp produced chromaticity coordinates (x,y) of 0.47 and 0.385, an operating lumens per watt (L / w) value of about 65 and a Qa value of 65 at a CCT of about 2430.

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Abstract

A lamp having improved color quality scale is provided. The lamp has a light-transmissive envelope and a phosphor layer comprising a first phosphor and a second phosphor wherein the first phosphor has an emission band with a maximum between 590 nm and 670 nm and the second phosphor has an emission band with a maximum between 520 nm and 570 nm. The light generated by the phosphor layer, when the lamp is energized, has delta chroma values for fifteen color samples of the color quality scale within select parameters. The delta chroma values are measured in the CIE LAB color space.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part utility application claiming priority under 35 U.S.C. 120 of prior-filed copending application Ser. No. 11 / 873463 , filed 17 Oct. 2007, entitled “ENHANCED COLOR CONTRAST LIGHT SOURCE”, which is hereby incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to a lamp, and in some embodiments, to a fluorescent lamp having enhanced color contrast.BACKGROUND[0003]Fluorescent lighting provides an energy-efficient alternative to common incandescent lighting. However, the adoption of fluorescent lighting has been hindered in certain applications such as illuminating items in a retail setting. The quality of object color under fluorescent lighting is an important aspect of the value of the light source. Fluorescent lighting can produce visible light having muted light in the red region of the spectrum and an overemphasized amount of light in the yellow region. ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H05B35/00H01J63/04F21Y101/00
CPCC09K11/595C09K11/665C09K11/71C09K11/7734C09K11/7774H05B41/2822C09K11/7777C09K11/778C09K11/7792H01J61/35H01J61/44C09K11/7776H01J61/48
Inventor BEERS, WILLIAM W.BALAZS, LASZLOBAKK, ISTVAN
Owner SAVANT TECH LLC
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